Hadronic $B$ decay reconstruction in early Belle II data

Abstract

Belle II is an experiment designed to study billions of $\tau$-lepton, $b$- and $c$-quark decays observed with low background in asymmetric-energy electron-positron collisions at the SuperKEKB $B$-factory. In March 2019, the newly completed Belle II started operating and collected its first physics data reaching 10 fb${}^{-1}$ to date. We report the reconstruction of prominent signals from various hadronic $B$ decays including $B^{-}\to D^{(\ast )0}{\pi }^{-}$, $B^0\to D^{-}{K}^{+}$, and $B^0\to K^{+}{\pi }^{-}$ in the first data set corresponding to 5.15 fb${}^{-1}$. These results show a remarkable level of early understanding of detector performance.

6 pages, 7 figures, Contribution to the Proceedings of the 18th International Conference on B-Physics at Frontier Machines - Beauty2019 - 29 September / 4 October, 2019, Ljubljana, Slovenia